Atomic weight and electronegativity

I think atomic weight and electronegativity are related and both lead to the same result:

Iodine being the least electronegative of the halogens cannot displace any other halogen from their respective halides.

In general, electronegativity increases on passing from left to right along a period, and decreases on descending a group. Hence, fluorine is undoubtedly the most electronegative of the elements


Ergo, fluorine will always displace iodine, and not vice-versa.. Tweet